Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2901
CALL
Associated Banc-Corp
ASB
$5.79B
| $1.15M | ﹤0.01% |
56,200
+55,915
| +19,619% | +$1.24M |
|
2902
iShares Select U.S. REIT ETF
ICF
$2.12B
| $1.15M | ﹤0.01% |
+17,601
| New | +$1.11M |
|
|
BLUE
2903
DELISTED
bluebird bio
BLUE
| $1.15M | ﹤0.01% |
2,774
-3,555
| -56% | -$1.41M |
|
2904
PUT
Guidewire Software
GWRE
$12.6B
| $1.15M | ﹤0.01% |
10,200
+10,137
| +16,090% | +$1.05M |
|
|
K
2905
DELISTED
Kellanova
K
| $1.15M | ﹤0.01% |
+19,030
| New | +$1.16M |
|
2906
PUT
LGI Homes
LGIH
$1.4B
| $1.15M | ﹤0.01% |
7,100
+7,098
| +354,900% | +$1.17M |
|
2907
Galicia Financial Group
GGAL
$8.03B
| $1.15M | ﹤0.01% |
133,255
+98,093
| +279% | +$825K |
|
2908
ProShares Ultra VIX Short-Term Futures ETF
UVXY
$243M
| $1.15M | ﹤0.01% |
164
+96
| +141% | +$984K |
|
2909
Elevance Health
ELV
$82B
| $1.15M | ﹤0.01% |
+3,000
| New | +$1.15M |
|
2910
HUB Group
HUBG
$2.91B
| $1.15M | ﹤0.01% |
34,734
+2,776
| +9% | +$94.5K |
|
2911
Scorpio Tankers
STNG
$3.9B
| $1.15M | ﹤0.01% |
51,956
-26,079
| -33% | -$530K |
|
2912
CALL
Momentus
MNTS
$86.1M
| $1.14M | ﹤0.01% |
+7
| New | +$1.02M |
|
2913
CALL
Pacific Biosciences
PACB
$422M
| $1.14M | ﹤0.01% |
+32,600
| New | +$948K |
|
2914
CALL
Rambus
RMBS
$10.2B
| $1.14M | ﹤0.01% |
48,100
+47,244
| +5,519% | +$951K |
|
2915
CALL
NOV
NOV
$7.46B
| $1.14M | ﹤0.01% |
74,400
+73,847
| +13,354% | +$1.15M |
|
2916
PUT
Array Technologies
ARRY
$834M
| $1.14M | ﹤0.01% |
73,000
+72,892
| +67,493% | +$1.54M |
|
2917
PUT
Fortuna Silver Mines
FSM
$2.59B
| $1.14M | ﹤0.01% |
205,200
+204,039
| +17,574% | +$1.35M |
|
2918
Vanguard FTSE Emerging Markets ETF
VWO
$119B
| $1.14M | ﹤0.01% |
20,915
+9,487
| +83% | +$505K |
|
|
PLAN
2919
PUT
DELISTED
Anaplan, Inc.
PLAN
| $1.14M | ﹤0.01% |
21,300
+21,152
| +14,292% | +$1.18M |
|
2920
PUT
Crown Holdings
CCK
$12.9B
| $1.13M | ﹤0.01% |
11,100
+10,996
| +10,573% | +$1.16M |
|
2921
PUT
Energizer
ENR
$1.45B
| $1.13M | ﹤0.01% |
26,400
+26,117
| +9,229% | +$1.22M |
|
2922
CALL
SELLAS Life Sciences
SLS
$2.14B
| $1.13M | ﹤0.01% |
102,200
+101,715
| +20,972% | +$993K |
|
|
TRIT
2923
CALL
DELISTED
Triterras, Inc. Class A Ordinary Shares
TRIT
| $1.13M | ﹤0.01% |
163,000
+161,981
| +15,896% | +$1.08M |
|
|
RIDE
2924
DELISTED
Lordstown Motors Corp. Class A Common Stock
RIDE
| $1.13M | ﹤0.01% |
6,830
+3,500
| +105% | +$538K |
|
|
KL
2925
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $1.13M | ﹤0.01% |
29,390
-66,487
| -69% | -$2.67M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.